Lipid conversion factors for calculating fatty acid contents of foods

  • John L. Weihrauch
  • Linda P. Posati
  • Barbara A. Anderson
  • Jacob Exler

Abstract and Summary

The U.S. Department of Agriculture is searching the world literature published since 1960 for data on food lipids and their fatty acid composition. These data are being used to update and expand the national tables of food composition and to establish a computerized nutrient data bank. Customarily, investigators report fatty acid data in terms of weight percent of total methyl esters. For the benefit of users of nutrient tables, relative amounts of com-ponent fatty acid esters should be converted to grams fatty acid (as free acid) per 100 grams food. For this purpose, conversion factors, defined as the weight of fatty acids in 1 gram of fat, were derived for various food products. Derivation of, and basis for, factors and their application are described for selected food products. Variables affecting factors are also dis-cussed. Investigators should include, in reports on fatty acid composition of foods, information on total lipid content and on the fatty acid content of the lipid. The latter values are readily obtained by a saponification procedure, complete acid hydrolysis, or if desired, by lipid class analysis.


Total Lipid Lipid Class Wheat Flour Fatty Acid Content Total Lipid Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    Kinsella, J.E., L.P. Posati, J.L. Weihrauch, and B.A. Anderson, Crit. Rev. Food Technol. 5:299 (1975).CrossRefGoogle Scholar
  2. 2.
    Posati, L.P., J.E. Kinsella, and B.K. Watt, J. Amer. Diet. Ass. 66:482 (1975).Google Scholar
  3. 3.
    Anderson, B.A., J.E. Kinsella, and B.K. Watt, —Ibid. 67:35 (1975).Google Scholar
  4. 4.
    Posati, L.P., I.E. Kinsella, and B.K. Watt, —Ibid. 67:111 (1975).Google Scholar
  5. 5.
    Fristrom, G.A., B.C. Stewart, J.L. Weihrauch, and L.P. Posati, —Ibid. 67:351 (1975).Google Scholar
  6. 6.
    Brignoli, C.A., J.E. Kinsella, and J.L. Weihrauch, —Ibid. 68:224 (1976).Google Scholar
  7. 7.
    Weihrauch, J.L., J.E. Kinsella, and B.K. Watt, —Ibid. 68:335 (1976).Google Scholar
  8. 8.
    Anderson, B.A., —Ibid. 69:44 (1976).Google Scholar
  9. 9.
    Exler, J., and Weihrauch, J.L., —Ibid. 69:243 (1976).Google Scholar
  10. 10.
    Murphy, E.W., B.K. Watt, and R.L. Rizek, JAOAC 57:1198 (1974).Google Scholar
  11. 11.
    Butrum, R., and S.E. Gebhardt, JAOCS 53:727A (1976).CrossRefGoogle Scholar
  12. 12.
    Jensen, R.G., J.G. Quinn, D.L. Carpenter, and J. Sampugna, J. Dairy Sci. 50:119 (1967).CrossRefGoogle Scholar
  13. 13.
    Federal Register 38:6961, March 14, 1973.Google Scholar
  14. 14.
    Folch, J., M. Lees, and G.H. Sloane-Stanley, J. Biol. Chem. 226:497(1957).Google Scholar
  15. 15.
    Acker, L., Getreide Mehl und Brot 28:181 (1974).Google Scholar
  16. 16.
    Morrison, W.R., D.L. Mann, W. Soon, and A.M. Conventry, J. Sci. Food Agr. 26:507 (1975).CrossRefGoogle Scholar
  17. 17.
    Willard, C., R.D. Englert, and L.M. Richards, JAOCS 31:131 (1954).CrossRefGoogle Scholar
  18. 18.
    Exler, J., J.E. Kinsella, and B.K. Watt, JAOCS 52:154 (1975).CrossRefGoogle Scholar
  19. 19.
    Stoddard, J.H., Fisheries Research Board of Canada Technical Report No. 79 (1968).Google Scholar
  20. 20.
    Mecham, D.K., in “Wheat Chemistry and Technology,” Edited by Y. Pomeranz, Monograph Series III (Revised), Amer. Assn. Cereal Chem., St. Paul, MN, 1971, p. 393.Google Scholar
  21. 21.
    MacMurray, T.A., and W.R. Morrison, J. Sci. Food Agr. 21:520 (1970).CrossRefGoogle Scholar
  22. 22.
    Fisher, N., B.M. Bell, C.E.B. Rawlings, and R. Bennet, —Ibid. 17:370(1966).CrossRefGoogle Scholar
  23. 23.
    Burkwall, M.P., Jr., and R.L. Glass, Cereal Chem. 42:236 (1965).Google Scholar
  24. 24.
    Inkpen, J.A., and F.W. Quackenbush, —Ibid. 46:580 (1969).Google Scholar
  25. 25.
    Moruzzi, G., R. Viviani, A.M. Sechi, and G. Lenaz, J. Food Sci. 34:581 (1969).CrossRefGoogle Scholar

Copyright information

© American Oil Chemists’ Society 1977

Authors and Affiliations

  • John L. Weihrauch
    • 1
  • Linda P. Posati
    • 1
  • Barbara A. Anderson
    • 1
  • Jacob Exler
    • 1
  1. 1.Consumer and Food Economics InstituteARS, USDAHyattsville

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